1. The US claims to have 14 active but that doesn't account for maintenance problems and the times when they're going in and out of port, something enemies track very closely. The real number is likely even lower than this already low number.
2. Why do you think superfuzes helps in a counter strike? They massively increase accuracy but that's not even the problem to solve in a MAD scenario. Superfuzes help in taking out an enemy's nuclear force while it's on the ground, as in the case of a first strike. You don't need them to hit cities.
3. Counting warheads is misleading because it ignores the possibility of interception or failure of the missiles themselves. Countering some number of those 24 missiles is entirely conceivable.
4. Yes, I know what CEP means because I too have read pages on Wikipedia. Is this your weak attempt at claiming expertise where none likely exists?
5. Here's an open letter from the actual experts that ran the US Strategic Command. They agree with me that the US nuclear triad is in dire need of modernization.
https://www.wsj.com/articles/the-u-s-nuclear-triad-needs-an-...
Some of their recommendations have already been implemented and a lot more needs to be done before we can rely on MAD being in effect in the future.
6. Putting the hopes of humanity on a few subs that were designed in the 1970s is a very dangerous idea. It's an admission that the triad is broken. When you've let two thirds of your redundant system fail, you've got a very urgent problem.